Nail-driving attachment for air hammers



May 26, 1925.

T. B. ELLWOOD NAIL DRIVING ATTACHMENT FOR AIR HAMMERS.

Filed Aug. 2, 1924 2 Sheets-Sheet 1 HHINIIWI. ill I \N May 26, 1925.

T. B. ELLWOOD NAIL DRIVING ATTACHMENT FOR AIR HAMMERS l IIII Filed Aug.1924 n n n n 2 heats-Sheet 2 an pewter v l fter i i925,

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Application mea- August 22, rest, Serial Zd'o. assess.

To all whom it may concern:

Be it known that I, Tnoaras BnNNELrr woon, a citizen of the UnitedStates, residing at Marshall, in the county of Harrison and gtateofTexas, have invented certain new and useful Improvements in Nail-DrivingAttachments for Air Hammers, of which the following is a specification.

This invention relates to nail driving devices, and has more particularreference'to an attachment for air hammers whereby nails may be drivenin a simple, eflicient and ready manner, and without requiring the sameto be struck by an ordinary hammer, which is almost an impossibility incertain inaccessible places, usually occasioned in the construction offrame-building's.

The primary object of my invention resides in the provision of a naildriving attachment which may be readily associated with air or otherpower hammers, and. whereby nails may. be driven in a nick v manner,without requiring any unusual abor on the part of the worker.

A further object of my invention resides in the provision of a naildriving attachment for hammers that includes a hopper for the nails,together with means for automatically delivering the nails, one at atime, in a position to be encountered by the driving rod or bar of theattachment, which driving bar or rod is operated upon by the drivingbullet or piston of the air or other power hammer. An additional andimportant object is to pro ide an attachment of this character, whereinnails may be driven, vertically, horiaontally, or at an incline in asimple and easy manner.

An additional object is to provide an attachment wherein the diil'erentparts thereof may be readily disassembled for repair, renewal orcleaning purposes.

With the foregoing and other objects in view, as the nature of theinvention will be better understood, the same comprises thenovel form,combination, arrangement of parts hereinafter more fully described,shown'in the accompanying drawings, and claimed.

Inthe drawings. wherein like reference characters indicate correspondingthroughout the several views Figure 1 is a top plan view of an airhammer, with which is associated a nail driving attachment constructedin accordance with the present invention.

parts;

Figure 2 is a fragmentary side elevational view thereof.

Figure 3 is an enlarged fragmentary longitudinal sectional view of theattachment per so. I Y

Figure 4 is an enlarged detail vertical sectional view, takensubstantially upon the line 44 of Figure 2, for more clearly disclosingthe nail hammer and the nail feed-- ing means comprised in the presentinvention, and

Figure 5 is an elevational view of the ,nail carrier and guide thatforms an essential part of the present invention.

Now having particular, reference to the drawing, and especially toFigures 1 and 2,

there is shown a well known form of air hammer, designated generally 5,with which the present nail driving attachment may be associated.

It is, however, to be understood, that I do not wish to be limited tothe association of my attachment with this particular type of gun,insomuch as in the futurepractice .0f

the-invention, minor changes may be made if necessary, to adapt the sameto other forms of fair hammers or power guns.-

The invention, per se, constitutes the provision of an open endedcylinder 6 of a desired length" that is formed upon its rear end and atdiametrically opposite oints with rearwardly extending outwardydiverging'arms 7-7, theends of which are formed with a coupling ring 8whereby the attachment may be rigidly secured to the forward end of, thebarrel 5 or" said air hammer 5, in a manner as clearly shown in saidFigures 1 and 2.

Upon the top side of said cylinder 6, and

intermediate the ends thereof is formed a' hopper 9, the forward wall ofwhich is bowed outwardly as; per Figure 4, while the rear wall thereofextends in a.true vertical plane from a point slightly off center of thelongitudinal axis of said cylinder 6, there being provided a restrictedhorizontal communicating passage 10, between said hopper and saidcylinder, whereby the nails that are disposed within said hopper may.pass oneby-one into the cylinder, and this, while the same are in ahorizontal position when not prevented from doing this by a meanshereinai'ter more fully described.

The upper open end of the hopper 9 is provided with a hinged lid 11, theforward edge of which normally enters the hopper through the medium ofthe helical spring 12, included in the hinged construction for obviouslyforcing the nails downwardly within the hopper. I

Disposed for free sliding horlzontal movement and for a partialrotation. with in said cylinder 6, is a relatively elongated tube 13,that will hereinafter be referred to as a nail carrier. The bore 14 ofthe rearr'nost half of said sleeve or nailcarrier is of greater crosssectional area as indicated at 15, than the forward end of said bore forproviding a shoulder 16 directly intermediate-the ends of the bore ofthe sleeve.

Extending within the beforementioned t erestricted forward end of thebore of said nail carrier for the purpose of providing a means formaintaining said bore in a true horizontal position, as well as forother pur oses, hereinafter to be more fully descri ed. Q

The rear end of this driving bar or rod 17 is provided with a head 18,upon which is formed a shankl9, of angular cross section that projectsinto the cylindrical end of the air hammer 5, whereby the air operatedpistonor .bullet of said air hammer will contact therewith for actuatingsaid driving bar or rod in an obvious manner. Surrounding the drivingbaror rod intermediate the shoulder16 of the nail carrier 13 and said head18 is an expansible helical spring 20 that serves as a means fornormally maintaining the nail carrier in the osition shown in Figures 1,2, and 3, and or maintaining the shank of said driving bar or rod inposition within the air ham- 'mer to be engaged by said air operatedbullet or piston. a

For limitin the longitudinal sliding movement of t e carrier within thecylinder 6 of. the attachment, said nail carrier is provided upon oneside thereof and adjacent the bottom with a laterally extendpin 21 thatextends through a longi- In tu inal guide slot 22, formed at a similarpoint upon the cylinder 6, and intermediate slightly offset with respectto the the ends thereof as more clearly shown in Fi ure 2. v

The nail carrier 13 is formed at a point assageway 10, in the hopper 9and cylinder 6, when said nail carrier is in an outwardly normallyextending osition with a nail shaped slot 23, above t 1e restricted areaportion of the bore 14,- and also at a point directly at the forward endof the enlarged area 15 of said bore, whereby, when said.

nail carrier is slid rearwardly by pressure of the same upon the workand sli htly rotated in the manner hereinafter escribed, as to bringsaid nail shaped slot directly beneath the passageway 10, between saidhopper 9 and cylinder 6, a single nail will pass therethrough and restupon the driving rod or bar 17, which at that time will be beneath saidnail shaped slot, it being obvious that when pressure of the tool uponthe work is released, the nail carrier will move forwardly, under theaction of the spring 20, whereu on the nail will then drop to arestricte directly forwardly of. the nail driving bar or rod 17,whereupon when the air is ap portion of the bore 14,

lied to the hammer 5, said bar or rod will operated, for striking thenail, resulting in thedriving of the same into the work. It will bereadily appreciated by those skilled in the art, that during the drivingof the nail, the pressure of the tool upon the work will cause therearward sliding movement of the nail carrier upon the cylinder 6. Afterone nail is driven, the release of pressure will occasion thepresentation of another nail at a shown in Figure 3. v

The rear end of the cylinder slot 22 is extended upwardly and rearwardlyas at- 24, Figure 2, whereby, when the pin 21'enpoint as clearly gagestherein, a turning of the nail carrier 13 will be occasioned, forpresenting'the nail shaped slot directly beneath the passageway 10between the hopper 9 and cylinder 6.

'For reventing, the passage of more than one nail into said nail shapedslot 23 of the nail carrier, there is provided a strip of spring metal25, riveted or otherwise suita ly secured at its upper end as at 26 tothe-rear straight wall of the hopper 9. The a lowermost end of thisspring carrying a cross strip 27, 'the oppositelends of which areprovided with inwardly extending lateral pins 28 that pass into saidpassageway 10, t rough the provision of openings 29,

in the rearwall'thereof. The strip 27 is formed intermediate its endswith a pendant curvilinear s ring strip 28, that lies in close relationto t eadjacent side of the c linder 6, the lower end of this strip beingformed at op osite sides with outturned ends 29, where y the strip canbe engaged by the before mentioned lug or pin 21 of the nail carriermeans 13, in the raising of the strip1 in an outward direction withrespect to t e cylinder 6, for manifestly retracting the in 28 in theopening 29, for allowing anot er nail to pass downwardly into the nailshaped slot of the nail carrier.

From the fqregoing description, when considered in connection with theaccomave provided a highly novel, simple and. efiicient form of naildriving attachment for panying drawing, it will be apparent that I entinvention, it is nevertheless to be understood that minor changes maybemade therein without departing from the spirit and scope of the appendedclaims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. in an attachment for power hammers of the character described, acylinder hav ing one end adapted forattachment to the usual cylinder endof the hammer, a hollow nail carrier longitudinally movable in thecylinder, a nail hopper, means formed on said carrier for establishingcommunication between the hopper and carrier, and a driving rodextending at one end into the carrier and being adapted for insertion atits other end within the cylinder of the hammer.

2. In an attachment for power hammers of the character described, acylinder having one end adapted for attachment to the usual cylinder endof the hammer, a hollowof the character described, an open endedcylinder, meansfor securing the cylinder to the usual cylinder end ofthe hammer, a nail hopper formed upon the cylinder and havingcommunication therewith, a tubular shaped nail carrier longitudinallyslidable within the cylinder, means on said carrier to receive a singlenail from the hopper, and a driving rod extending at its forward endwithin the carrier and adapted to be inserted at its opposite end withinthe cylinder of the carrier;

4. In an attachment for power hammers oi the character described. anopen ended cylinder, means for securing the cylinder to the usualcylinder end of the hammer, a nail hopper formed upon the cylinder andhaving communication therewith, a tubular shaped nail carrierlongitudinallyslidable within the cylinder, means on said carrier toreceive a single nail from the hopper. a driving rod extending-at itsforward end part of the operf within the carrier and adapted to beinserted at its opposite end within the cylinder of the carrier, andautomatic. means for regulating the passage of nails from the hopperinto the carrier.

5. In an attachment for power hammers of the character described, anopen ended cylinder, means for securing the cylinder to the usualcylinder end of the hammer, a nail hopper formed upon the cylinder andhaving communication therewith, a tubular shaped nail carrierlongitudinally slidable within the cylinder, means on said carrier toreceive a single nail from the hopper, a driving rod extending at itsforward end within the carrier and adapted to be inserted at itsopposite end within the cylinder of the carrier, and automatic means formaintaining said end of the driving rod in the cylinder of the hammer. i

4 6. In an attachment for power hammers of the character described, anopen ended cylinder, means for securing the cylinder to the usualcylinder end of the hammer, a'

nail hopper formed upon the cylinder and having communication therewith,a tubular shaped nail carrier longitudinally slidable within thecylinder, means on said carrier to receive a single nail from thehopper, a driving rod extending at its forward end within the carrierand ada ted to be inserted at its opposite end within the cylinder ofthe carrier, automatic means for maintaining said end of the driving r0d1n the cylinder of the hammer and for maintaining the carrier in aposition in which-1t is out of communication with the hopper.

7. An attachment for a pneumatic hammer comprising a nail receivinghopper having an intermediate restricted nail passage opening into abottom cylinder, said cylinder being open at its opposite ends, atubular nail carrier slidably mounted in said cylinder, spring means fornorma lly projecting the nail carrier to-nail driving position, theextended portion of said carrier being provided with a nail shaped slotadapted to register with the aforesaid restricted passage, said slotbeing normally out of alignment with said passage and being moved intoalignment with the passage against tension of said spring means, a rodextending from the hammer through one end of the cylinder and into saidcarrier, and attaching arms carried by the last named end of thecylinder and extendingtherefrom and adapted to be connected to 120 thehammer. 1 r c v In testimony. whereof I aflix my signature. s

' THOMAS BENN ELLWOOD.

